* Wall clock interrrupts
@ 2008-01-25 6:38 James Courtier-Dutton
2008-01-25 7:55 ` Clemens Ladisch
0 siblings, 1 reply; 2+ messages in thread
From: James Courtier-Dutton @ 2008-01-25 6:38 UTC (permalink / raw)
To: ALSA development
Hi,
Do all sound cards hardware have wall clocks that one can generate
interrupts from?
I know all Creative and E-Mu cards do.
I am looking to use the wall clock interrupt for triggering events in
application space, but would like to know what other sound cards support it.
James
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Wall clock interrrupts
2008-01-25 6:38 Wall clock interrrupts James Courtier-Dutton
@ 2008-01-25 7:55 ` Clemens Ladisch
0 siblings, 0 replies; 2+ messages in thread
From: Clemens Ladisch @ 2008-01-25 7:55 UTC (permalink / raw)
To: James Courtier-Dutton, ALSA development
James Courtier-Dutton wrote:
> Do all sound cards hardware have wall clocks that one can generate
> interrupts from?
> I know all Creative and E-Mu cards do.
Some ISA cards and the Yamaha DS-1 chips do; all other cards have only
the PCM period interrupt.
> I am looking to use the wall clock interrupt for triggering events in
> application space,
I guess you want to synchronize those events to the PCM playback?
This makes sense only when the PCM is running, and in that case you can
use the PCM slave timer.
Regards,
Clemens
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2008-01-25 7:55 ` Clemens Ladisch
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